﻿package cn.edu.shengda;

interface ShapeArea{
public double getArea();
public double getPerimeter();
}
class Rectangle implements ShapeArea{
private double height;
private double width;
public Rectangle(double w, double h){
this.width = w;
this.height = h;
}
public double getArea() {
return height * width;
}
public double getPerimeter() {
return 2 * (height + width);
}
public String toString(){
return "width=" + width + ",height=" + height + ",perimeter=" + getPerimeter() + ",area" + getArea();
}
}
class Circle implements ShapeArea{
private double r;
public Circle(double r){
this.r = r;
}
public double getArea() {
return Math.PI * r * r;
}
public double getPerimeter() {
return 2 * Math.PI * r;
}
public String toString(){
return "r =" + r + ", area = " + getArea() + ", perimeter = " + getPerimeter();
}
}

public class Test {
public static void main(String[] args) {
ShapeArea rectangle = new Rectangle(1, 2);
ShapeArea circle = new Circle(1);
System.out.println(rectangle.toString());
	System.out.println(circle.toString());
}
}